| 摘要 |
A telescopic lens system includes a positive first lens group, and a positive second lens group. The first lens group includes cemented lens elements having a positive lens element and a negative lens element. The second lens group includes a positive lens element and a negative lens element. The telescopic lens system satisfies the following condition:whereinSigma|S1I| designates the total sum of the absolute values of the spherical aberration coefficients (Seidel coefficients) of the first lens group, andSigma|S1| designates the total sum of the absolute values of the spherical aberration coefficients (Seidel coefficients) of the entire telescopic lens system.
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